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Journal of Materials Science & Technology 2017年第6期33卷 507-515页

作者： Chunjie Huang Wenya Li marie-pierre planche Hanlin Liao Ghislain Montavon ICB UMR 6303 CNRS Univ.Bourgogne Franche-ComtéUTBM State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University

In this study, cold spraying（CS） was used to deposit a mixture of nickel-coated graphite and 40 vol.% Al powder（Ni-Gr/Al） on a steel substrate aiming to effectively preserve a certain volume fraction of graphite in the deposited Ni-Gr/Al composite coating. The microstructure of the as-sprayed coating and the effect of post-spray heat-treatment（PSHT） temperatures on the in-situ formation of Ni-Al intermetallic phases in coating were studied. The tribological behaviors of the as-sprayed coating and the PSHTed coating under 450？C were tested at 25？C, while the as-sprayed coating was tested at 450？C for *** a result, the Ni-Gr particles showed a homogenous distribution in the coating. The multilayer Ni-Al intermetallics-coated graphite/Al composite coating was achieved in situ after the PSHT of 450？C, where the graphite did decompose at 550？C leaving big pores in the coating. The coefficients of friction（COF）of the CSed coating and the PSHTed coating were measured at 450？C as well as 25？C, which showed a similar tendency, much higher than that of the CSed coating tested at 25？C. The lubrication phase（graphite） improved the formation of a graphite film during sliding friction and decreased the COF, while the hard Ni-Al intermetallic phases contributed to the increase of COF.

关键词： Cold spraying Ni-coated graphite powder Post-spray heat-treatment Intermetallics Tribological performance

Effect of Substrate Type on Deposition Behavior and Wear Performance of Ni-Coated Graphite/Al Composite Coatings Deposited by Cold Spraying

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Journal of Materials Science & Technology 2017年第4期33卷 338-346页

作者： Chunjie Huang Wenya Li Yingchun Xie marie-pierre planche Hanlin Liao Ghislain Montavon ICB UMR 6303 CNRSUniversite Bourgogne Franche-ComteUTBMF-90100 BelfortFrance State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China

This work focused on the deposition characteristics and wear behavior of Ni-coated graphite mixed with40 vol.% Al（Ni-Gr/Al） composite coatings sprayed on an Al alloy and a steel substrate by cold spraying（CS）. The morphology of the flattened Ni-Gr particles was examined by single-impact tests. Crosssectional microstructure and wear performance of the Ni-Gr/Al composite coatings were studied. Results showed that a larger number of Ni-Gr particles were finally bonded with the steel substrate, whereas many craters existed on the Al alloy substrate after the single-impact tests. The coating on the steel substrate had a high thickness, high graphite content and low coeficient of friction（COF） compared to those on the Al alloy substrate. In addition, the CS coatings presented a homogeneous distribution and uniform morphology of graphite, and a comparative COF to that of conventional thermal sprayed coatings. It was shown that CS could avoid the decomposition and transformation of graphite phase.

关键词： Cold spraying Ni-coated graphite Deposition behavior Microstructure Wear performance

In-flight particle characterization and coating formation under low pressure plasma spray condition

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Journal of Iron and Steel Research International 2017年第3期24卷 306-312页

作者： Nan-nan Zhang Dan-yang Lin Ya-li Li Yue Zhang marie-pierre planche Han-lin Liao Christian Coddet Fu-yu Dong Department of Material Science and Engineering Shenyang University of Technology IRTES-LERMPS University of Technology of Belfort-Montbeliard

Yttria-stabilized zirconia（ YSZ） coatings were deposited by low pressure plasma spray（ LPPS） in 1.0× 10^4 Pa,1.5 × 10^4 Pa,and 2.5 × 10^4 Pa. Both in-flight particle diagnostic detected by DPV-2000 system and ANSYS-FLUENT software were used to study the connection between the parameters of flying particles and the coating formation,which might help to recognize the relationship between the operation parameters and the coatings quality. The results of simulation showed that particles in a lower spray pressure could achieve a higher velocity. The particle velocity was around 380 m/s at a distance of 35 cm from the nozzle at 1.0 × 10^4 Pa while only 300 m/s at 2.5 × 10^4 Pa in actual *** results showed that the velocity of particles increased with decreasing the spray pressure,which might enhance the flattening rate of coatings and thereby decreased the porosity. The deposited YSZ coating with the lowest porosity can be gained under 1.0 × 10^4 Pa condition.

关键词： In-flight particle detection Low pressure plasma spray Yttria-stabilized zirconia coating Flame simulation

Development of an Emulator for the Plasma Process Control

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Journal of Mechanics Engineering and Automation 2015年第1期5卷 10-18页

作者： marie-pierre planche Taikai Liu Sihao Deng Ghislain Montavon Research Institute on Transport Energy and Society--Laboratory of Engineering Research on Materials Processes and SurfacesUniversity of Technology of Belfort-Montbeliard Belfort 90010 France

This work aims at developing an automatic system for the control of the APS （air plasma spraying） plasma process in which some instability phenomena are present. APS is a versatile technique to produce coatings of powder material at high deposition rates. Using this technique, powder particles are injected into a plasma jet, where they are melted and accelerated towards a substrate. The coating microstructures and properties depend strongly on the characteristics of the plasma jet, which can be controlled by the adjustment of the process parameters. However, the imeractions among the spray variables, render optimization and control of this process are quite complex. Understanding relationships between coating properties and process parameters is mandatory to optimize the process technique and the product quality. We are interested in this work to build an on-line control model for the APS process based on the elements of artificial intelligence and to build an emulator that replicates the dynamic behavior of the process as closely as possible.

关键词： Atmospheric plasma spray process parameters artificial neural networks fuzzy logic emulator

Cold-Sprayed Magnesium Coatings Deposited with Helium and Air

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稀有金属材料与工程 2012年第S1期41卷 61-63页

作者： M P planche R Bolot C Coddet LERMPS University of Technology of Belfort-Monbeliard90010Belfort cedexFrance

Cold-sprayed magnesium coatings have been little researched although cold spraying has been applied to deposit a large number of materials such as metals,metal matrix *** the present study,helium gas and air were employed as the propelling gases to deposit Mg coatings under the temperature of 600℃and 630℃.The effect of gas types on the coating microstructure was *** is much interesting to find that the particle deposition efficiency using helium gas as propelling gas is lower than that using *** suggests that strong erosion occurred during cold spraying using helium *** porosity of the coating using helium gas is lower than that using *** addition,the in-flight particle velocity was also simulated by the FLUENT software to explore the effect of gas *** modeled results show that the in-flight particle velocity using helium is higher than the erosion velocity of Mg particle.

关键词： cold spraying magnesium coating microstructure particle velocity electrochemical cell

Energy Valorization by Continuous Pyrolysis of Straight Vegetable Oils (SVOs)

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Green and Sustainable Chemistry 2018年第1期8卷 19-31页

作者： Abollé Abollé Konan Edmond Kouassi Henri planche Albert Trokourey Kouassi Benjamin Yao Ado Ado Gossan Unité de Formation et de Recherche-SFA Université Nangui Abrogoua (UNA) Abidjan Republic of C&#244 te d’Ivoire Unité de Chimie et Procédés Ecole Nationale Supérieure des Techniques Avancées Paris France Unité de Formation et de Recherche-SSMT Université Houphou&#235 t-Boigny (UFHB) Abidjan Republic of C&#244 te d’Ivoire Institut National Polytechnique Félix Houphouë t-Boigny Yamoussoukro Republic of C&#244 te d’Ivoire

Researches have been undertaken to find a form of valorization of the surplus production of vegetable oils in Côte d’Ivoire for their use as a substitute diesel. The first tests of the use of crude oils-diesel blends by the company Palmindustrie faced enormous difficulties. We have therefore undertaken a campaign of pyrolysis of Tropical Straight Vegetable Oils: palm, copra, peanut, cotton, cabbage palm and shea, between 400°C and 600°C under atmospheric pressure. A silica support was used in co-catalysis either with water or with methylcyclohexane, which is a model compound of cetanes contained in gas oil. This compound has the advantage, unlike the gas oil itself, of not masking the peaks of the pyrolysis recombinates of oils in the chromatograms. The condensed organic phase consists mainly of hydrocarbons including paraffins, olefins, alkylbenzenes and styrenes. The yields of liquid hydrocarbons vary between 72% and 86%. A comparative study of coke precursors and gas production was carried out. A discussion on the parameters to be considered for a large-scale implementation was undertaken.

关键词： Straight Vegetable Oils (Palm Copra Peanut Palm Kernel Cotton and Shea) Hydrocarbons Coke

Gingival biotype: The probe test utility

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Open Journal of Stomatology 2013年第2期3卷 123-127页

作者： Madline Cuny-Houchmand Stéphane Renaudin Mustapha Leroul Lucie planche Laurent Le Guehennec Assem Soueidan Cellule de Promotion de la Recherche Clinique CHU Nantes France Department of Orthodontics UFR d’Odontologie Nantes France Department of Periodontology UFR d’Odontologie Nantes France Department of Prosthodontics UFR d’Odontologie Nantes France

Purpose: To evaluate the relevance of the probe test in classifying the gingival biotype and to determine if differences exist between maxillary and mandibular gingival biotypes in the same patient. Materials and Methods: 53 subjects were included. The gingival thickness was evaluated as thick or thin. This evaluation was based on the transparency of the periodontal probe through the gingival margin while probing the sulcus. In another hand, 124 clinicians were asked to identify the gingival biotype in the same 53 subjects based on visual inspection on pictures. For each examiner, the accuracy in identifying the gingival biotype was assessed using the percentage of cases correctly identified. Results: the percentile of agreement is greater than 70% in maxilla as well as in mandible. An imbalance was observed on the maxillary pictures concerning the gingival biotype and on the thin biotype between maxilla and mandible despite there being no statistical difference (p < 0.0001). The percentile of agreement is quite similar in the mandible for both thin (74%) and thick (70%) gingival biotypes. Agreement between mandibular probe and maxilla probe results demonstrates a weak percentile of agreement of gingival biotypes between maxillary and mandibular anterior teeth (57%). Conclusion: The use of probe transparency through the gingival margin is an accurate and simple method for gingival biotype diagnosis to discriminate a thin gingival from a thick gingival. Furthermore, individualizing the gingival biotype for each of the arches appears to be a new outcome that needs further investigation.

关键词： Probe Gingival Biotype Prevention Classification